Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per 10 milliliters (mg/10 ml). A random sample of eight adults gave the following information. Ex = 64.1; Ex? = 526.19; Ey = 89.9; Ey? = 1050.07; Exy = 735.88 %3D %3! x 6.2 y 9.6 8.9 10.3 7.0 7.5 11.7 8.4 14.2 6.8 7.0 10.0 14.1 9.3 12.2 Part A 10.8 (a) Find the equation of the least-squares line. (Round your answers to three decimal places.) (b) Draw a scatter diagram for the data. Graph the least-squares line on your scatter diagram. Part B 14 14 12 12 a 10 b 10 8 8 6 6 6 8 10 12 14 6. 8. 10 12 14 y 14 14 12 12 d, 10 10 8 8 6 8 10 Part C 6 12 14 6 8 10 12 14 (c) Find the sample correlation coefficient r and the sample coefficient of determination 2. (Round your answers to three decimal places.) Explain the meaning of 2 in the context of the application. (Round your answer to one decimal place.) % of the variance in blood glucose level ---Select-- Select-- |is explained by the model and the variance in blood glucose level ---Select-- --- after drinking sugar water after a 12-hour fast ---Select-- after drinking sugar water after a 12-hour fast

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Author:Amos Gilat
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Chapter1: Starting With Matlab
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Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per 10 milliliters (mg/10 ml). A random sample of eight adults gave the following information.

I need help with Part A, B, and C

Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per
10 milliliters (mg/10 ml). A random sample of eight adults gave the following information.
Ex = 64.1; Ex² = 526.19; Ey = 89.9; Ey2 = 1050.07; Exy = 735.88
6.2
8.9
7.0
7.5
8.4
6.8
10.0
9.3
Part A
9.6
10.3
10.8
11.7
14.2
7.0
14.1
12.2
(a) Find the equation of the least-squares line. (Round your answers to three decimal places.)
(b) Draw a scatter diagram for the data. Graph the least-squares line on your scatter diagram.
Part B
y
у
14
14
12
12
a
b
10
10
8
8
6
6
6
8
10
12
14
6
8
10
12
14
y
y
14
14
12
12
C
d
10
10
8
8
6
6
6
8
10
12
14
6
8
10
12
14
Part C
(c) Find the sample correlation coefficient r and the sample coefficient of determination r2. (Round your answers to three decimal places.)
r =
2 =
Explain the meaning of r in the context of the application. (Round your answer to one decimal place.)
% of the variance in blood glucose level ---Select--
v is explained by the model and the variance in blood glucose level
-Select---
---Select---
---Select---
after drinking sugar water
Y after a 12-hour fast
after drinking sugar water
after a 12-hour fast
(d) If x = 9.0, use the least-squares line to predict y. (Round your answer to two decimal places.)
y =
Find an 80% confidence interval for your prediction. (Round your answers to two decimal places.)
lower limit
mg/10 ml
Part D
upper limit
mg/10 ml
(e) Use level of significance 1% and test the claim that the population correlation coefficient p is not zero. (Round your test statistic to three decimal places.)
t =
Part E
Find or estimate the P-value of the test statistic.
O P-value > 0.500
O 0.250 < P-value < 0.500
O 0.200 < P-value < 0.250
O 0.150 < P-value < 0.200
O 0.100 < P-value < 0.150
O 0.050 < P-value < 0.100
O 0.020 < P-value < 0.050
O 0.010 < P-value < 0.020
O 0.001 < P-value < 0.010
O P-value < 0.001
Conclusion
O Reject the null hypothesis, there is sufficient evidence that p + 0.
O Reject the null hypothesis, there is insufficient evidence that p + 0.
O Fail to reject the null hypothesis, there is sufficient evidence that p + 0.
O Fail to reject the null hypothesis, there is insufficient evidence that p + 0.
Interpret the resul
O At the 1% level of significance, there is sufficient evidence that there is a linear correlation between the two glucose measurements.
O At the 1% level of significance, there is sufficient evidence that there is not a linear correlation between the two glucose measurements.
O At the 1% level of significance, there is insufficient evidence that there is a linear correlation between the two glucose measurements.
O At the 1% level of significance, there is insufficient evidence that there is not a linear correlation between the two glucose measurements.
(f) Find an 85% confidence interval for the slope B of the population-based least-squares line. (Round your answers to three decimal places.)
Part F
lower limit
upper limit
Explain its meaning in the context of the application.
O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to increase by an amount that falls within the confidence interval.
O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to decrease by an amount that falls outside the confidence interval.
O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to increase by an amount that falls outside the confidence interval.
O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to decrease by an amount that falls within the confidence interval.
Transcribed Image Text:Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per 10 milliliters (mg/10 ml). A random sample of eight adults gave the following information. Ex = 64.1; Ex² = 526.19; Ey = 89.9; Ey2 = 1050.07; Exy = 735.88 6.2 8.9 7.0 7.5 8.4 6.8 10.0 9.3 Part A 9.6 10.3 10.8 11.7 14.2 7.0 14.1 12.2 (a) Find the equation of the least-squares line. (Round your answers to three decimal places.) (b) Draw a scatter diagram for the data. Graph the least-squares line on your scatter diagram. Part B y у 14 14 12 12 a b 10 10 8 8 6 6 6 8 10 12 14 6 8 10 12 14 y y 14 14 12 12 C d 10 10 8 8 6 6 6 8 10 12 14 6 8 10 12 14 Part C (c) Find the sample correlation coefficient r and the sample coefficient of determination r2. (Round your answers to three decimal places.) r = 2 = Explain the meaning of r in the context of the application. (Round your answer to one decimal place.) % of the variance in blood glucose level ---Select-- v is explained by the model and the variance in blood glucose level -Select--- ---Select--- ---Select--- after drinking sugar water Y after a 12-hour fast after drinking sugar water after a 12-hour fast (d) If x = 9.0, use the least-squares line to predict y. (Round your answer to two decimal places.) y = Find an 80% confidence interval for your prediction. (Round your answers to two decimal places.) lower limit mg/10 ml Part D upper limit mg/10 ml (e) Use level of significance 1% and test the claim that the population correlation coefficient p is not zero. (Round your test statistic to three decimal places.) t = Part E Find or estimate the P-value of the test statistic. O P-value > 0.500 O 0.250 < P-value < 0.500 O 0.200 < P-value < 0.250 O 0.150 < P-value < 0.200 O 0.100 < P-value < 0.150 O 0.050 < P-value < 0.100 O 0.020 < P-value < 0.050 O 0.010 < P-value < 0.020 O 0.001 < P-value < 0.010 O P-value < 0.001 Conclusion O Reject the null hypothesis, there is sufficient evidence that p + 0. O Reject the null hypothesis, there is insufficient evidence that p + 0. O Fail to reject the null hypothesis, there is sufficient evidence that p + 0. O Fail to reject the null hypothesis, there is insufficient evidence that p + 0. Interpret the resul O At the 1% level of significance, there is sufficient evidence that there is a linear correlation between the two glucose measurements. O At the 1% level of significance, there is sufficient evidence that there is not a linear correlation between the two glucose measurements. O At the 1% level of significance, there is insufficient evidence that there is a linear correlation between the two glucose measurements. O At the 1% level of significance, there is insufficient evidence that there is not a linear correlation between the two glucose measurements. (f) Find an 85% confidence interval for the slope B of the population-based least-squares line. (Round your answers to three decimal places.) Part F lower limit upper limit Explain its meaning in the context of the application. O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to increase by an amount that falls within the confidence interval. O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to decrease by an amount that falls outside the confidence interval. O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to increase by an amount that falls outside the confidence interval. O For each additional mg/10 ml of blood glucose level after a 12-hour fast, the blood glucose level 1 hour after drinking sugar water is expected to decrease by an amount that falls within the confidence interval.
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